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I sometimes have trouble spelling, especially some of the different British, Canadian and American versions.

acknowledgement, acknowledgment
ageing, aging
aeroplane, airplane
aesthetics, esthetics
aluminium, aluminum
among, amongst
amortise, amortize
anaemia, anemia
anaesthesia, anesthesia
analogue, analog
analyse, analyze
annex, annexe
apnoea, apnea
apologise, apologize
archaeology, archeology
armour, armor
artefact, artifact
authorise, authorize
axe' ax
balk, baulk
banister, bannister
behaviour, behavior
behove, behoove
blonde (for female), blond
B.Sc., B.S.
burette, buret
burnt, burned
bussed, bussing, bused, busing
Caesarean, Cesarean
calibre,caliber
cancelled, canceled
candour, candor
capitalise, capitalize
carburettor, carburetor
catalogue, catalog
catalyse, catalyze
centre, center
cheque (noun, money), check
chequered, checkered
chilli, chili
cigarette, cigaret
clamour, clamor
collectable, collectible
colour, color
connection, connexion
cosy, cozy
counsellor, counselor
criticise, criticize
demeanour, demeanor
defence, defense
dialogue, dialog
diarrhoea, diarrhea
dietician*, dietitian dietitian*, dietician dietician, dietitian
dispatch*, despatch dispatch dispatch
doughnut, donut
Dr, Dr.
draught (current of air), draft
dreamt, dreamed
emphasise, emphasize
encyclopedia, encyclopædia
endeavour,endeavor
enquiry, inquiry
enrol, enroll
favour, favor
fibre, fiber
flautist, flutist
flavour, flavor
focused, focusing, focussed, focussing
foetus, fetus
forever, for ever
fuelling,fueling
fulfil, fulfill
gauge, gage
generalise, generalize
glamour, glamor
gonorrhoea,gonorrhea
grey, gray
gynaecology, gynecology
haemorrhage, hemorrhage
harbour, harbor
harmonise, harmonize
haulier, hauler
homeopathy, homoeopathy
honour, honor
humour,humor
initialise, initialize
instalment, installment
jewellery, jewelry
judgment, judgement
kerb (noun), curb
kilometre, kilometer
label, labelled, labelling, label, labeled, labeling
labour, labor
lasagne, lasagna
leant, leaned
learnt, learned
licence (noun), license
license (verb), licence
litre, liter
manoeuvre, maneuver
marvellous,marvelous
maximise, maximize
meagre, meager
metre (unit of length), meter
modelled, modeled
modelling, modeling
mould, mold
moustache, mustache
mum, mom
neighbour, neighbor
net, nett (amount of money)
oedema, edema
oesophagus, esophagus
oestrogen, estrogen
offence, offense
omelette, omelet
organisation, organization
organise, organize
optimise, optimize
orientate, orient
orientated, oriented
orthopaedic, orthopedic
pædiatrics, pediatrics
paedophile, pedophile
paralyse, paralyze
parlour, parlor
parallelling, parallelled, paralleling, paralleled
peddler, pedlar
pleaded, pled
plough, plow
practise (verb), practice
pretence, pretense
programme (TV), program (computer)
pyjamas, pajamas
rancour, rancor
realise, realize
recognise, recognize
rigour,rigor
saleable, salable
saviour, savior
savour, savor
sceptical
sceptical, skeptical
signalling, signaling
skilful, skillful
slipped disc, slipped disk
smelt, smelled
speciality, specialty
sulphur, sulfur
theatre, theater
theatregoer, theatergoer
titbit, tidbit
towards, toward
travelling, traveling
tumour, tumor
tyre, tire
valour, valor
vapour, vapor
vice (the device), vise
vigour, vigor
visualise, visualize
wagon, waggon
woollen, woolen